Dynamic 4 ENF test for a strain rate dependent mode II interlaminar fracture toughness characterization of unidirectional carbon fibre epoxy composites |
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| Institution: | 1. Mechanical and Industrial Production Department, Mondragon Unibertsitatea, Loramendi 4, 20500, Arrasate-Mondragón, Spain;2. Structural Reliability and Mechatronics Area, IK4-Ikerlan Technology Research Centre, Pº J.M. Arizmendiarrieta, 2, 20500, Arrasate-Mondragón, Spain;3. Civil Engineering Department, Universidad de Málaga, C/ Dr. Ortiz de Ramos s/n, 29071, Málaga, Spain;1. Revolution Fibres, 9a Corban Ave, Henderson, Auckland 0612, New Zealand;2. School of Engineering, University of Waikato, Private Bag 3105, Hamilton, New Zealand;1. Mechanical and Industrial Production Department, Mondragon Unibertsitatea, Loramendi 4, 20500 Mondragón, Spain;2. Civil Engineering Department, Universidad de Málaga, C/Dr. Ortiz de Ramos s/n, 29071 Málaga, Spain;1. University of Palermo – DICGIM, 90128 Palermo, Italy;2. University of Palermo – DICAM, 90128 Palermo, Italy;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2. Center for Civil Aviation Composites, Shanghai 201620, China;3. Shanghai Key Laboratory of Lightweight Structural Composites, Shanghai 201620, China;4. Shanghai University of Engineering Science, Shanghai 201620, China;5. Zhongyuan University of Technology, Zhengzhou 450000, China |
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| Abstract: | A dynamic 4ENF testing procedure has been proposed to characterize the influence of loading rate on mode II fracture interlaminar toughness of a unidirectional composite material. The stable crack growth accomplished by the proposed dynamic 4ENF procedure allows achievement of the R-curves and the in-situ compliance calibration of each specimen. This enables performance of a monotonic dynamic test and presents a great advantage for the dynamic interlaminar characterization of the composite material. The dynamic GIIC-s values obtained are similar to those determined by quasi-static loading conditions, which suggests that the proposed testing procedure is able to determine accurately the dynamic GIIC of a composite material. However, for the tested material and within the analysed loading rate range, both the determined R-curves and GIIC values do not show any clear sign of loading rate dependence. |
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| Keywords: | Delamination Interlaminar fracture toughness Mechanical properties |
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